Skip to main content
The '''halogens''' or '''halogen elements''' () are a group (periodic table)|group in the periodic table consisting of five chemically related chemical element|elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The artificially created element 117 (ununseptium) may also be a halogen. In the modern IUPAC nomenclature, this group is known as '''group 17'''. The group of halogens is the only Group (periodic table)|periodic table group that contains elements in three of the four main states of matter at Standard conditions for temperature and pressure|standard temperature and pressure. All of the halogens form acids when bonded to hydrogen. Most halogens are typically produced from minerals or salt (chemistry)|salts. The middle halogens, that is chlorine, bromine and iodine, are often used as disinfectants. Organobromides are the most...